J. Mater. Sci. Technol. ›› 2022, Vol. 128: 205-212.DOI: 10.1016/j.jmst.2022.03.033

• Research Article • Previous Articles     Next Articles

Preventing surface passivation of transition metal nanoparticles in oxygen electrocatalyst to extend the lifespan of Zn-air battery

Peng Zhuoa, Han Changcuna, Huang Chuyuna, Dong Zehuab,*(), Ma Xinguoa,*()   

  1. aHubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, School of Science, Hubei University of Technology (HBUT), Wuhan 430068, China
    bHubei Key Laboratory of Material Chemistry and Service Failure, Key laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
  • Received:2022-01-24 Revised:2022-03-17 Accepted:2022-03-24 Published:2022-11-20 Online:2022-11-22
  • Contact: Dong Zehua,Ma Xinguo
  • About author:maxg@hbut.edu.cn (X. Ma).
    *E-mail addresses: zhdong@hust.edu.cn (Z. Dong),

Abstract:

Prolonging the lifespan of oxygen catalysts in Zn-air batteries was urgently required for the potential commercialization. Herein, two interactional active species were integrated into porous N-doped carbon microspheres (Co-Fe-Ru/PNCS) to act as bifunctional oxygen electrocatalysts. Due to the electron transfer from Ru to Co/Fe element, the high value state of Ru could promote OER performance and reduce the charge voltage of the battery. An extended cycle stability of 200 h was achieved in Co-Fe-Ru/PNCS-based battery. Moreover, the quasi in-situ potentiodynamic sweep of air-electrode in battery cell confirmed it was the incorporation of Ru that avoided the passivation of Co/Fe-based nanoparticles. Accordingly, this novel electrocatalyst may provide a new strategy of designing durable bifunctional oxygen electrocatalyst for Zn-air batteries.

Key words: Prussian blue analogous, Bifunctional electrocatalysts, Zn-air batteries, Quasi in-situ electrochemical tests